Here is the code snippet to open a webpage externally in a browser from the app using a button click. Now I am not sure where exactly you want to add this button. If you want to add it when the report gets submitted. You could do that in the Pages>ResultsPage.qml. You need to open the project in QT creator.

I have a similar question and would like help with more of the code. I just want a button on the main page of the quick report app that will take the user to a web map of already crowd-sourced information. Thanks